Malicious PDF — malware analysis report

Static analysis result for SHA-256 533e9fc47db0cb8e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 08:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87f9db0cfa9b7aeb516f7852fe82ebc6 SHA-1: 089e09840f5a2ca8609810d1eb126376eb08df31 SHA-256: 533e9fc47db0cb8e1a3c2b562ed7e70c18bce906c3b7dc3dce04a87c9812becd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The embedded URLs and link farm structure are consistent with an attempt to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vetregistr.com/ckfinder/userfiles/files/36379991753.pdf In PDF document text
    • https://dalba.net/other_files/File/22778483049.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2910f6cf---devurezumidogi.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/55466210315.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/68922770245.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/10965900886.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/80966714310.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/wenurugexopule.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/vewudafefoveto.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/75428451126.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/83766612454.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/kuwukenugowa.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/legowalotin.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/81626083270.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/dunadipazilasutekud.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b6d6b324---fadoganuduvu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/xixaxud.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/towezizuxodarabaj.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/83958378369.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf9f368d6---tazilerenitedewubikanax.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210911141531_978687321.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/77564404436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=wrong+turn+movie+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 17256 bytes
SHA-256: 890adda7a2d9d8a42ac5fc9d46d82b868e103b94a95ba07667c9f1d39cbb6877
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001218a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 10668 bytes
SHA-256: f76241a6a0b9a1911555e4114df5b720bd23ee9aa98e2584f50c347436d5b622

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